Yesterday we cleaned a 40m2 resin set driveway that hadn't been cleaned for a good while along with a rear patio, steps and side path. Our client was very pleased with the end results. Before the work was agreed to go ahead the gentleman wanted a free demo on the rear patio because when he pressure washed it in the past, it made no difference. He was pleasantly surprised with the result we soon achieved however, I advised him it needs to be chemically cleaned to get into the pours of the stone to fully remove all traces of algae and black spot lichen. Unfortunately he did not want this level of cleaning but the results are still quite remarkable.